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JEE Physics · Medium

Fluid Mechanics: Viscosity MCQ

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ViscosityMediumQuestion 30930

Question

Newton's law of viscosity states that shear stress is proportional to:
  1. A
    Velocity
  2. B
    Velocity gradient (dv/dy)
    Correct
  3. C
    Pressure
  4. D
    Density

Correct answer

Velocity gradient (dv/dy)

Explanation

τ = η(dv/dy). The constant of proportionality η is called dynamic viscosity (unit: Pa·s).

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